ABSTRACT
This paper reports the preliminary results obtained from a campaign of experimental measurements carried out on two strategic structures located in Central Italy and affected by the seismic sequence started on August 24, 2016. The epicentre was located among the municipalities of Accumoli (province of Rieti), Amatrice (province of Rieti) and Arquata del Tronto (province of Ascoli Piceno). About 51 seismic events have been recorded from August 24, 2016 to February 03, 2017. The dynamic characterization of a hospital in Spoleto and of a school in Norcia retrofitted with dissipative bracing devices, were carried out to detect the stiffness variation, assumed as damage indicator, during the seismic sequence. Data was provided by the Seismic Observatory of Structures (OSS), a network of permanent seismic monitoring systems installed on public buildings, bridges and dams and managed by the Italian Department of Civil Protection (DPC). Modal parameters have been identified from the accelerometric responses recorded at several floors of the buildings.
